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2-isoform of Na-K-ATPase mediates ouabain-induced hypertension in mice and increased vascular contractility in vitro
Departments of 1Molecular Genetics, Biochemistry, and Microbiology and 2Molecular and Cellular Physiology, College of Medicine, University of Cincinnati, Cincinnati, Ohio; and 3Hypertension Unit, University of Ottawa Heart Institute, and 4Department of Medicine and Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
Submitted 29 January 2004 ; accepted in final form 28 September 2004
Although ouabain is known to induce hypertension, the mechanism of how this cardiac glycoside affects blood pressure is uncertain. The present study demonstrates that the 
2-isoform of the Na-K-ATPase mediates the pressor effects of ouabain in mice. To accomplish this, we analyzed the effect of ouabain on blood pressure in wild-type mice, where the 2-isoform is sensitive to ouabain, and genetically engineered mice expressing a ouabain-insensitive 2-isoform of the Na-K-ATPase. Thus differences in the response to ouabain between these two genotypes can only be attributed to the 2-isoform of Na-K-ATPase. As the 1-isoform is naturally resistant to ouabain in rodents, it will not be inhibited by ouabain in either genotype. Whereas prolonged administration of ouabain increased levels of ouabain in serum from both wild-type and targeted animals, hypertension developed only in wild-type mice. In addition, bolus intravenous infusion of ouabain increased the systolic, mean arterial, and left ventricular blood pressure in only wild-type anesthetized mice. In vitro, ouabain increased vascular tone and thereby phenylephrine-induced contraction of the aorta in intact and endothelium-denuded wild-type mice but in 2-resistant mice. Ouabain also increased the magnitude of the spontaneous contractions of portal vein and the basal tone of the intact aorta from only wild-type mice. The increase in aortic basal tone was dependent on the presence of endothelium. Our studies also demonstrate that the 2-isoform of Na-K-ATPase mediates the ouabain-induced increase in vascular contractility. This could play a role in the development and maintenance of ouabain-induced hypertension.
vascular tone; blood pressure; cardiac glycosides; serum level
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